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• W3105486435 endingPage "020" @default.
• W3105486435 startingPage "020" @default.
• W3105486435 abstract "One of the predictions of the $Lambda$CDM cosmological framework is the hierarchical formation of structure, giving rise to dark matter (DM) halos and subhalos. When the latter are massive enough they retain gas (i.e., baryons) and become visible. This is the case of the dwarf satellite galaxies in the Milky Way (MW). Below a certain mass, halos may not accumulate significant amounts of baryons and remain completely dark. However, if DM particles are Weakly Interacting Massive Particles (WIMPs), we expect them to annihilate in subhalos, producing gamma rays which can be detected with the Fermi satellite. Using the three most recent point-source Fermi Large Area Telescope (LAT) catalogs (3FGL, 2FHL and 3FHL), we search for DM subhalo candidates among the unidentified sources, i.e., sources with no firm association to a known astrophysical object. We apply several selection criteria based on the expected properties of the DM-induced emission from subhalos, which allow us to significantly reduce the list of potential candidates. Then, by characterizing the minimum detection flux of the instrument and comparing our sample to predictions from the Via Lactea II (VL-II) N-body cosmological simulation, we place conservative and robust constraints on the $langlesigma vrangle-m_{DM}$ parameter space. For annihilation via the $tau^+tau^-$ channel, we put an upper limit of $4times 10^{-26}~(5times 10^{-25})~cm^3~s^{-1}$ for a mass of 10 (100) GeV. A critical improvement over previous treatments is the repopulation we made to include low-mass subhalos below the VL-II mass resolution. With more advanced subhalo candidate filtering the sensitivity reach of our method can potentially improve these constraints by a factor 3 (2) for $tau^+tau^-$ ($b bar{b}$) channel." @default.
• W3105486435 created "2020-11-23" @default.
• W3105486435 creator A5003653536 @default.
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• W3105486435 creator A5090935742 @default.
• W3105486435 date "2019-07-12" @default.
• W3105486435 modified "2023-10-16" @default.
• W3105486435 title "Unidentified gamma-ray sources as targets for indirect dark matter detection with the<i>Fermi</i>-Large Area Telescope" @default.
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